Steel buckling‐restrained braced frames with single and dual corner gusset connections: seismic tests and analyses
Steel buckling‐restrained braced frames with single and dual corner gusset connections: seismic tests and analyses
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DOI：
10.1002/eqe.1176
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发表时间：
2012-06
影响因子：
4.5
通讯作者：
C. Chou;Jia-hua Liu;D. Pham
中科院分区：
文献类型：
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作者：
C. Chou;Jia-hua Liu;D. Pham
通过一层、一湾BRBF组件的循环试验和框架在地震作用下的动力分析，对三层屈曲约束支撑框架（BRBF）的设计进行了评估。试验的重点是评估(1)安装在框架中的夹层BRB的抗震性能，(2)自由边加强筋和双扣板配置对角扣板性能的影响，(3)角扣板中框架和支撑的作用力，以及(4)最大相当地震级别下BRBF的破坏模式。在BRB中，组件框架在漂移2.5%时表现良好，最大轴向应变为1.7%。在没有自由边加强筋的情况下，单角扣板屈曲的强度明显低于美国钢结构协会（2005）规范的预测。采用与单折板尺寸相近的双折板可消除屈曲现象。在低漂移情况下，框架作用在拐角扣板上的力与支撑力的大小相同。然而，在高漂移时，框架作用力显著增加，并导致柱-板边缘焊缝断裂。对三层BRBF进行了非线性时程分析，以获得设计和最大相当地震荷载水平下的抗震需求。分析结果证实，在循环加载试验中，BRB和角扣板均实现了峰值漂移。版权所有©2011 John Wiley & Sons， Ltd
The design of a three‐story buckling‐restrained braced frame (BRBF) with a single‐diagonal sandwiched BRB and corner gusset was evaluated in cyclic tests of a one‐story, one‐bay BRBF subassembly and dynamic analyses of the frame subjected to earthquakes. The test focused on evaluating (1) the seismic performance of a sandwiched BRB installed in a frame, (2) the effects of free‐edge stiffeners and dual gusset configurations on the corner gusset behavior, (3) the frame and brace action forces in the corner gusset, and (4) the failure mode of the BRBF under the maximum considerable earthquake level. The subassembly frame performed well up to a drift of 2.5% with a maximum axial strain of 1.7% in the BRB. Without free‐edge stiffeners, the single corner gusset plate buckled at a significantly lower strength than that predicted by the specificationof American Institute of Steel Construction (2005). The buckling could be eliminated by using dual corner gusset plates similar in size to the single gusset plate. At low drifts, the frame action force on the corner gusset was of the same magnitude as the brace force. At high drifts, however, the frame action force significantly increased and caused weld fractures at column‐to‐gusset edges. Nonlinear time history analyses were performed on the three‐story BRBF to obtain seismic demands under both design and maximum considerable levels of earthquake loading. The analytical results confirmed that the BRB and corner gusset plate achieved peak drift under cyclic loading test. Copyright © 2011 John Wiley & Sons, Ltd.